text: General purpose diagrams include:
  *PV diagram
  *T–s diagram
  *h–s (Mollier) diagram
  *Psychrometric chart
  *Cooling curve
  *Indicator diagram
  *Saturation vapor curve
  *Thermodynamic surface
  Specific to weather services, there are mainly three different types of thermodynamic diagrams used:
  * Skew-T log-P diagram
  * Tephigram
  * Emagram
  All three diagrams are derived from the physical P–alpha diagram which combines pressure (P) and specific volume (alpha) as its basic coordinates. The P–alpha diagram shows a strong deformation of the grid for atmospheric conditions and is therefore not useful in atmospheric sciences. The three diagrams are constructed from the P–alpha diagram by using appropriate coordinate transformations.
  Not a thermodynamic diagram in a strict sense, since it does not display the energy–area equivalence, is the 
  * Stüve diagram
  But due to its simpler construction it is preferred in education.
  Another widely-used diagram that does not display the energy–area equivalence is the θ-z diagram (Theta-height diagram), extensively used boundary layer meteorology.